Just to throw a cat amongst the pigeons ..............

Can someone explain to me why trim mixes do not fall under the concept of "preprogramming" ???

It would seem to me that mixing the ailerons and elevators (for example) to move when the rudder is moved could be considered to be "Preprogramming devices to automatically perform a series of commands". These are generally not straight line mixes so it could even be construed that they execute a 'series' of commands.

Have fun